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Chapter 8 FET Amplifiers
Chapter 8 FET Amplifiers

... The common-gate is similar to the common base BJT amplifier in that it has a low input resistance. The voltage gain can be determined by the same formula as used with the JFET commonsource amplifier. The input resistance can be determined by the formula below. ...
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... Gain A in this expression contains the frequency dependence that shapes the circuit’s frequency response. Note that the denominator of this response contains the feedback factor Z1/(Z1 + Z2). This makes the denominator 1 + Aβ and this relates the circuit to the model presented next. To more complete ...
APPLICATION BULLETIN
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... 1/β INTERCEPT MARKS BANDWIDTH LIMIT The bandwidth limit of most op amp circuits occurs at the 1/β intercept with the open-loop gain curve. Some circuits reduce bandwidth further, through reactive feedback elements, but all op amp circuits encounter a bandwidth limit at the 1/β intercept. Figure 6 i ...
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TDA2050 - STMicroelectronics

... Using this signal and load network the measurement may be made without causing excessive dissipation in the amplifier. The dissipation in the 1 ohm resistor is much lower than a rated output power of the amplifier, because the duty-cycle of the high output current is low. By feeding the amplifier ou ...
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... to persons (and livestock where present,) or from fire, attendant upon the use of electrical energy. Dead. ...
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... Modern solid-state equipment uses supply voltages typically in the range of 3 to 15 volts. Tube equipment supply voltages start at 100 volts and go up from there. The supply voltages in a tube power amp may be something like +350 volts. In an RF linear amplifier or microwave oven, thousands of volts ...
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... supply. One of them generates and controls only positive voltages, the other one the negative voltages. The power supply system functioning logic is directed by a single circuit, called PWM CONTROLLER, which also attends to the PWM generation in the positive power supply and operates in a synchronic ...
EE 321 Analog Electronics, Fall 2011 Homework #8 solution
EE 321 Analog Electronics, Fall 2011 Homework #8 solution

... 40 mA/V and rπ is 2.5 kΩ. Draw the complete amplifier model using the hybridπ BJT equivalent circuit. Calculate the overall voltage gain vc/vs. What is the value of BJT β implied by the values of the model parameters? To what value must β be increased to double the overall voltage gain? ...
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... from the CAR-DDS Unit and an audio signal from the microphone are applied to balanced modulator IC Q1087 (SN16913) on the MAIN Unit. The control signal from MODE SW IC Q1021 (BU4094BCFV) on the MAIN Unit causes a voltage of AM 5V to be sent from transistor Q1079 (2SC4154E). This voltage is applied t ...
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Light Emitting Diodes and Digital Circuits I
Light Emitting Diodes and Digital Circuits I

... The answer to the question on Figure 5 is: “about 3 mA”. We use the circuit shown in Figure 6 to determine whether a point in a TTL circuit is logically high or logically low. If it is high then this point will not cause much voltage drop on the 1k resistor and the LED will glow. If the point is low ...
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17227 2 - SK Engineering Academy
17227 2 - SK Engineering Academy

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Regenerative circuit



The regenerative circuit (or regen) allows an electronic signal to be amplified many times by the same active device. It consists of an amplifying vacuum tube or transistor with its output connected to its input through a feedback loop, providing positive feedback. This circuit was widely used in radio receivers, called regenerative receivers, between 1915 and World War II. The regenerative receiver was invented in 1912 and patented in 1914 by American electrical engineer Edwin Armstrong when he was an undergraduate at Columbia University. Due partly to its tendency to radiate interference, by the 1930s the regenerative receiver was superseded by other receiver designs, the TRF and superheterodyne receivers and became obsolete, but regeneration (now called positive feedback) is widely used in other areas of electronics, such as in oscillators and active filters. A receiver circuit that used regeneration in a more complicated way to achieve even higher amplification, the superregenerative receiver, was invented by Armstrong in 1922. It was never widely used in general receivers, but due to its small parts count is used in a few specialized low data rate applications, such as garage door openers, wireless networking devices, walkie-talkies and toys.
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